Question

我在xib中有一个ViewController（登录视图），它有2个UITextField和1个UIButton组件。视图层次结构是

 UIView
     -> UIScrollView
         -> UIView (contentView)
             -> UITextField
             -> UITextField
             -> UIButton

我在视图中使用autolayout。 UIScrollView有4个约束，即前导，尾随，顶部和顶部。底部与其超级视图对齐（UIViewController视图）。 ContentView有4个约束，即前导，尾随，顶部和顶部。底部到超级视图（UIScrollView）和宽度匹配UIViewController视图。

我已按照Apple documentation中的步骤向上或向下滚动，当用户选择UITextField时，键盘不在UITextField之上。

当显示键盘时，滚动视图会向上滚动，但是当键盘被隐藏时，scrollview不会向后滚动。任何帮助表示赞赏。

override func viewDidLoad() {
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
}

func keyboardWillHide(notification: NSNotification) {

        let contentInsets: UIEdgeInsets = UIEdgeInsets.zero
        self.scrollView.contentInset = contentInsets
        self.scrollView.scrollIndicatorInsets = contentInsets
    } 

func keyboardWillShow(notification: NSNotification) {

        if let activeField = self.activeField, let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {

            let contentInsets = UIEdgeInsets(top: 0.0, left: 0.0, bottom: keyboardSize.height, right: 0.0)

            self.scrollView.contentInset = contentInsets
            self.scrollView.scrollIndicatorInsets = contentInsets

            var aRect = self.view.frame

            aRect.size.height -= keyboardSize.size.height
            if (!aRect.contains(activeField.frame.origin)) {
                self.scrollView.scrollRectToVisible(activeField.frame, animated: true)
            }
        }
    }

Answer 1

苹果文档中详细解释了键盘的这个问题：

https://developer.apple.com/library/content/documentation/StringsTextFonts/Conceptual/TextAndWebiPhoneOS/KeyboardManagement/KeyboardManagement.html

或者，尝试以下代码：

guid

Answer 2

scrollView df.loc[ (df.Rand <= 0.4) , 'Park' ] = lambda:[5,10,15,20] df.loc[ (df.Rand > 0.4) & (df.Rand <= 0.8) , 'Park' ] = lambda:[4,9,14,19] df.loc[ (df.Rand > 0.8) , 'Park' ] = lambda:[6,11,16,21] df.Park = df.Park.apply(lambda x: x())不是contentInset.top因此我遇到了问题。在隐藏键盘后，将0.0正确更改后，将scrollView设置为原始位置。

contentInset.top

在选择文本字段时，调整键盘

2 个答案: